Shaking-screen.



P. M. KUEHN. SHAKING SCREEN.

APPLICATION FILED APR.2. 1914.

3 SHEETS-SHEET 1- Patented Nov. 2, 1915.

' WV. mo

P.. M. KUEHN.

'SHAKING SCREEN. I APPLICATION FILED mm. 1914.

Patented Nov. 2, 1915.

3 SHEEFS-SHEET 2- P. M. KUEHN.

SHAKING SCREEN.

APPLICATION FILED APR.2. 1914.

Patented Nov. 2, 1915.

3 SHEETS-SHEET 3- UNITED STATES PATENT OFFICE.

PAUL M. KUEHN, OF BALTIMORE, MARYLAND, ASSIGNOR TO THE BARTLETT HAYWARD COMPANY, OF BALTIMORE, MARYLAND, A CORPORATION OF MARYLAND.

'SHAKING-SCREEN.

Specification of Letters Patent.

Patented Nov. 2, 1915.

Application filed April 2, 1914. Serial No. 828,949.

To all whom it may concern:

Be it known that 1, PAUL M. KUEHN, a citizen of the United States, residing at Baltimore, in the State of Maryland, have invented certain new and useful Improvements in Shaking-Screens, of which the following is a specification.

This invention relates to improvements in shaking screens and has more particularly reference to screens of considerable weight.

One object of the invention is to provide a rigid supporting structure between which the screen or screens may be sustained in an improved manner preferably with one screen-end overlapping another screen-endthe sustainin means having yielding buffers to take the shock during the shifting movement of the screens from one direction to another.

Another object of the invention is to pro-.

vide an improved arrangement of buffers distributed between the supporting structure and the screen or screens so that the strains caused by the shifting of the screen or screens will be distributed over the supporting structure at numerous points and racking of the apparatus will be avoided.

With these and other objects in view the invention is illustrated in the accompanying drawings, wherein,

Figures 1 and 1, illustrate the structural metal side supports and the screens in top plan. Figs. 2 and 2*, show sidesupports in side elevation. Fig. 3, illustrates the screen structure in end elevation. Fig. 4, shows on an enlarged scale the lapped screens in side elevation and also shows the sustaining means and a portion of the side supporting structure. Figs. 5 and 6, illustrate front face and side or edge elevations respectively of one of the hanger arms. Fig. 7, shows a detail on an enlarged scale of a portion of the screen bottom and side wall and one of the suspension spindles. Fig. 8, illustrates the shaft which imparts a reciprocating-mo tion to the screens. Fig. 9, shows an enlarged sectional detail through one of the rods which pivotally sustains the bufier rods, and Fig. 10, illustrates a cross-sectional detail through one of the buffer bars. Fig. 11, shows a modified form of buffer, andFig. 12 illustrates an end view of the spring shown in Fig. 11.

Referring to the drawings the numeral, 11, designates two parallel side metal girders, constructed in a strong and rigid manner and preferably connected by cross-bars, 12, which serve to tie the same together. The vertical wall, 13, of each supporting girder is provided with a'series of bearing brackets, 14,,the brackets being so disposed in the two vertical girder-walls that a rod, 15, may extend horizontally across the girders at each bracket and have one end sustained in a bracket on one girder and its other end sustained in another bracket directly opposite and on the other girder. It is therefore to be understood that there will be as many rods, 15, extending horizontally between the girders as there are bracketbearings on either of the said girders.

Each .rod, 15, pivotally sustains two hanger arms, 16,one arm being on the rod at the inner side of and adjacent to one girder support, and the other arm being on the same rod adjacent to the inner side of the other girder support. Each hanger arm, as shown particularly in Figs. 5 and 6 of the drawings, is stamped up from heavy metal with a central longitudinal rib, 17 and two side flanges, 18. The ends of each hanger arm are folded back and riveted at, 19, to the flanges, 18, and each fold is formed into an eye so that each hanger will have an eye, 20, at one end and another eye, 21, at the opposite end and a bushing, 22, is provided in each hanger eye. The hanger-eyes, 20, receive the ends of rods, 15, which latter form the pivot from which said hangers depend. The longitudinal rib, 17, of each hanger arm is provided with a slot, 23, located preferably adjacent to the eye, 21, which latter in practice is the lower eye, as will presently be more fully explained.

' In so far as constructionis concerned the bearing brackets 14, rods, 15, and hanger arms, 16, are alike throughout the device, but by reference to Figs. 2, 2, and 4, of the drawings, it will be seen that at one end of the machine the bearing brackets are positioned lower down on the vertical. wall of the girder supports than those bearing brackets at the opposite end of the machine. This is due to the fact that in the present instance two screen frames, 24, and, 25, respectively are employed in the machine and screen frame, 24, is somewhat lower than screen frame, 25, and in order to utilize. the same length of hanger arm throughout the machine, those bearing brackets which sustain the rods that carry the hangers for the lower screen frame are somewhat lower on the girder than the brackets from which thehigher screen frame are hung. I

The screen frames are of substantially the same construction and a description of one is deemed sufiicient. Each screen-frame has two longitudinal side walls, 26, and a bottom, 27 The bottom of each screen is provided with a number of perforations, 28, which latter are arranged in groups, each group differing in size and becoming larger according to their distance from the receiv- .ing end of the screen. At intervals the two side walls of the screen-frames are connected at their upper sides by cross-bars, 29, while at the lower or bottom side each screen frame has a series of crosswise angle bars, 30, extending horizontally between and connecting the side walls. The outer end of each angle-bar, 30, carries an arm, 31, with a spindle, 32, at the outer projecting end thereof, as best seen in Fig. 7, of the drawing, so that along the bottom and at both 5 sides of each screen frame there will be a series of spindles which project toward the inner side of the supporting girder wall. The locations of these spindles with respect to the lower ends of the hanger arms are such that each spindle will engage or extend through the bushing, 22, of an eye, 21, of a a hanger arm so that the screen frame will be pivotally sustained from and swing between the pendant hanger arms at opposite sides. From the foregoing explanation it will be seen that the upper ends of the hanger arms, 16, are pivotally sustained from the horizontal cross-rods, 15, and hang pendantly from said rods at the inner sides of the sup porting side girders; that the screen frames extend longitudinally between the girders and have position between the pendant hanger arms at opposite sides and that thelower ends of the said hanger arms are pivotally engaged by spindles which extend I horizontally from the under side of the screen frames and thereby sustain the screen frames.

The screen frames are to be oscillated by means presently to 'be described and to take up the shock at the end of each oscillating stroke I have provided an improved arrangement of yielding buffers, which willnow' be described, attention being directed more particularly to Figs. 4, 5, and 9, of the drawings. It has heretofore been pointed out that the hanger arms, 16, are provided with'a slot, 23, adjacent to their lower ends, and by reference to Figs. 2, 2 and 4, it will be seen that some of the hanger arms coact with buffer rods, 33, which latter extend through the hanger arm slots, 23, and have eyes, 34. These buffer rods have an inclined position with respect tothe screen frames and hanger arms and the eye-ends thereof extend below the bottom of the screen with which they coact. Suitable horizontal rods, 35, extend crosswise between the girders and below the" screen frame and said rods are so located as to extend through the eyes of two bufler rods at directly opposite sides ofthe screen frame. In order to hold the buffer rod eyes properly on the rods, 35, the latter are provided with tubular spacing sleeves, 36, and, 37. The sleeves, 36, are interposed between the eye of a rod and the inner side of the girder adjacent thereto and the sleeve, 37, is located on the rod, 35, between two buffer rod eyes so that lateral movement of the eyes 8@ on the rod, 35, will be prevented.

Each buffer rod, 35, has an adjusting nut, 38, thereon between the eye and the hanger arm, and a coiled spring, 39, encircles said rod, 35, and is interposed between the said adjusting nut, 38, and the rear side of the hanger arm. On the upper free end of the rods, 35, I provide coiled springs, 40, which have one end seated against the front side of the hanger arms and their other ends held W by seating against adjusting nuts, 41, on the extreme end of the rods. llt will therefore be seen that by extending the buffer rods through the hanger arms andprov iding a bufier spring, 39, and, 40, on opposite sides of the arms, and then pivotally sustaining one end of each buffer rod, I provide a yielding buffer on each side of the said arms, one of. which buffers checks the movement of the arms as they swing the screen frame in one direction, and the other buffer will check the movement of said arms when they swing the screen frame in a reverse direction. It will also be noted that the free ends of the. buffer rods, 33, will rock as the hanger arms swing but that longitudinal movement of the rods will be prevented by reason of their pivot attachment to the horizontal rods, 35.

By referring'to Fig. 4 of the drawing it will be noted that the inner ends of the two screen frames, 24, and, 25, lap,the lower and foremost screen frame, 24, underlapping the higher and rearmost screen frame, 25. It will also be noted that the higher overlapping end of the screen frame, 25, car- 115 ries a pivoted flap, 42, whose lower free end rests upon the upper side of the lower screen frame to close the space between said lapping frames and prevent the material that is being screened from working back bew tween the screens.

A. shaft, 43, is sustained in suitable bearings, 44, at opposite sides of the machine and has two sets of crank arms, 45, and, 46, respectively thereon. Two connecting rods, 12 47, extend from the crank arms, 45,. back to and engage the screen frame, 25, while two otlger connecting rods, 48, extend forwardly from the crank arms, 46, and connect with the screen frame, 24. The relative positions of the crank arms, 45, and, 46, are such that the screen frames will be reciprocated toward and from each other and by means of the hanger arms the motion imparted to the screens will be through an are instead of a direct reciprocation so that the advance of the material will be somewhat retarded and at the same time tumbled so as to eflect'a turning of the materials during the screening and enable the smaller particles to work under the mass and discharge through the smaller openings.

Motion is imparted to the shaft, 43, by means of a pulley, 49, which is driven by a belt, 50, from a motor, 51, or other power means.

In Fig. 11, a modified form of hanger arm bufi'er is shown which consists of a threaded rod, 52, extending through the hanger arm, 16, with adjusting nuts, 53, and, 54, on opposite sides of said arm. This rod has a head, 55, with an exterior circumferential spiral groove, 56, therein so that one end of a spiral spring, 57, may engage the head by means of said groove. The other end of the spring, 57, engages a spiral groove, 59, on an eye-block, 60, and said block has an eye, 61,

through which the cross-rods, 35, will extend. By means of this construction the springs, 57, will compress as the screens and arms approach the limit of movement in one direction and thereby check the screens and when moved in a reverse direction the springs must be expanded to allow the screens to make their full stroke and thereby check the movement on this reverse stroke.

Having thus described my invention what I claim and desire to secure by Letters Patent is 1.-In a shaking screen the combination with a supporting means, of a plurality of pivoted devices carried by the supporting means; a screen pivotally connected to said pivoted devices; means for reciprocating the screen; means in the path of the pivoted devices to retard their movement as they near the limit of movement in one direction, and means also in the path ofsaid pivoted devices to retard the latter as they near the limit of movement in the other direction.

2. In a shaking screen the combination with a supporting means, of a plurality of hanger arms pivotally sustained by and depending from the supporting means; a screen pivotally sustained between said hanger arms; means for reciprocating said screen and hanger arms and springs at opposite sides of some of said arms .to retard their movement.

3. In ashaking screen the combination with a supporting means, of a plurality of hanger arms pivotally sustained by and depending from the supporting means; a

screen pivotally sustained between said hanger arm; means for reclprocatlng said screen and hanger arms; a bufl'er rod extending through some of said hanger arms and a spring on the said bufi'er rod at op posite sides of the hanger arm.

4. In a shaking screen the combination with a. supporting means, of a plurality of hanger arms pivotally sustained by and depending from the supporting means; a screen pivotally sustained between said hanger ,arms; means for reciprocating said screen and hanger arms; bufi'er rods having one end pivotally sustained with respect to the supporting means and their other ends engaging some of said hanger arms and springs on the buffer rods and engaging op-' posite sides of said hanger arms.

In testimony whereof I aflix my signature I in presence of two witnesses. Y

PAUL M. KUEHN.

Witnesses:

GEO. E. PRoBEs'r, Jr., CHAS. B. MOURN. 

